:root {
    --color-background: #0a0a0f;
    --color-text: #c8c8d0;
    --color-star: #ffffff;
    --color-nebula-primary: rgba(90, 70, 140, 0.25);
    --color-nebula-secondary: rgba(50, 90, 130, 0.2);
    --font-family-base: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --float-distance: 0.75rem;
}

*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html,
body {
    height: 100%;
}

body {
    background-color: var(--color-background);
    color: var(--color-text);
    font-family: var(--font-family-base);
    overflow: hidden;
    -webkit-user-select: none;
    user-select: none;
}

.space {
    position: fixed;
    inset: 0;
    z-index: 0;
    overflow: hidden;
    pointer-events: none;
}

.space__nebula {
    position: absolute;
    inset: -20%;
    background:
        radial-gradient(circle at 25% 30%, var(--color-nebula-primary), transparent 45%),
        radial-gradient(circle at 75% 70%, var(--color-nebula-secondary), transparent 50%);
    filter: blur(40px);
    animation: nebula-shift 40s ease-in-out infinite alternate;
}

.space__stars {
    position: absolute;
    inset: 0;
    background-repeat: repeat;
    background-position: 0 var(--offset-y, 0px);
    background-size: var(--tile-size) var(--tile-size);
    animation: stars-twinkle var(--twinkle-duration) ease-in-out infinite alternate;
}

.space__stars--small {
    --tile-size: 200px;
    --twinkle-duration: 4s;
    background-image:
        radial-gradient(1px 1px at 20px 30px, var(--color-star), transparent),
        radial-gradient(1px 1px at 90px 140px, var(--color-star), transparent),
        radial-gradient(1px 1px at 160px 70px, var(--color-star), transparent),
        radial-gradient(1px 1px at 130px 180px, var(--color-star), transparent);
}

.space__stars--medium {
    --tile-size: 300px;
    --twinkle-duration: 6s;
    background-image:
        radial-gradient(1.5px 1.5px at 50px 80px, var(--color-star), transparent),
        radial-gradient(1.5px 1.5px at 210px 40px, var(--color-star), transparent),
        radial-gradient(1.5px 1.5px at 140px 250px, var(--color-star), transparent);
}

.space__stars--large {
    --tile-size: 400px;
    --twinkle-duration: 3s;
    background-image:
        radial-gradient(2px 2px at 100px 120px, var(--color-star), transparent),
        radial-gradient(2px 2px at 320px 300px, var(--color-star), transparent);
}

.page {
    position: relative;
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100%;
    padding: 1.5rem;
}

.page__message {
    font-size: clamp(1.5rem, 4vw, 2.5rem);
    font-weight: 300;
    letter-spacing: 0.1em;
    text-align: center;
    text-transform: uppercase;
    animation: text-float 6s ease-in-out infinite alternate;
}

@keyframes text-float {
    from {
        transform: translateY(calc(var(--float-distance) * -1));
    }
    to {
        transform: translateY(var(--float-distance));
    }
}

@keyframes stars-twinkle {
    from {
        opacity: 0.4;
    }
    to {
        opacity: 1;
    }
}

@keyframes nebula-shift {
    from {
        transform: translate(-3%, -2%) scale(1);
    }
    to {
        transform: translate(3%, 2%) scale(1.1);
    }
}

@media (prefers-reduced-motion: reduce) {
    .space__nebula,
    .space__stars,
    .page__message {
        animation: none;
    }
}